Plot pdf from histogram - dice

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Mel Hernandez
Mel Hernandez 2018-1-30
回答： Akira Agata 2018-11-25
I set up my histogram:
AllRoll = randi(6,50000, 1);
SumRoll = sum(AllRoll, 2);
Bins = (1:6);
hist(SumRoll,Bins);
title(sprintf('Histogram'));
xlabel(sprintf('1-6'));
ylabel(sprintf('number of rolls'));
grid on
hold on
I'm trying to turn this into a pdf. I know I have to bring down the values so that it can equal 1, but I'm not sure what I'm dividing and multiplying and summing here.

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采纳的回答

Akira Agata
Akira Agata 2018-2-5
hist function is not recommended. Please use histogram function instead.
And by setting the 'Normalization' option, PDF can be plotted, like:
AllRoll = randi(6,50000, 1);
SumRoll = sum(AllRoll, 2);
Edges = 0.5:1:6.5;
histogram(SumRoll,Edges,'Normalization','probability');
title(sprintf('PDF'));
xlabel(sprintf('1-6'));
ylabel(sprintf('Probability'));
grid on
hold on
  1 个评论
jyoti mundra
jyoti mundra 2018-11-23
why cannot we use pdf value for normalisation property of histogram. What it will give?

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更多回答（1 个）

Akira Agata
Akira Agata 2018-11-25
You can set 'Normalization' option of histogram function to 'pdf', like:
histogram(SumRoll,Edges,'Normalization','pdf');
If you want to obtain pdf value for each pip of a die, you can use histcount function.
p = histcounts(SumRoll,Edges,'Normalization','pdf');
The result is as follows:
>> p
p =
0.1649 0.1683 0.1640 0.1688 0.1681 0.1659

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